Marries in midweek? (4)
I believe the answer is:
weds
I believe this is a double definition.
'marries' is the first definition.
(I know this)
'midweek?' is the second definition.
(short for Wednesday)
'in' acts as a link.
(Other definitions for weds that I've seen before include "midweek" , "day?" , "Joins together" , "Makes match" , "Marries" .)